I used to like instrumental post-rock a lot. Now I mostly don't. I do, however, still love the Dirty Three. They're an Australian band who differentiate themselves from the legions of cloned post-rock bands by the absolutely stunning violin playing of Warren Ellis (also known for his long association with Nick Cave, including working with him on the soundtrack to The Assassination of Jesse James).
I bought a violin in an attempt to be as awesome as Warren Ellis, but it hasn't worked yet as I am godawful at violin.